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Engineering Fano resonances in plasmonic metasurfaces for colorimetric sensing and structural colors
Reza Kohandani1, Simarjeet Singh Saini1
1Department of Electrical and Computer Engineering, University of Waterloo, 200 University Ave West, Waterloo, ON N2L 3G1, Canada.
Nanotechnology
|October 7, 2024
Summary
This study introduces novel titanium dioxide (TiO2) metasurfaces producing vivid structural colors and demonstrating potential for sensitive biochemical sensing. The nanostructure achieves high-quality Fano resonances for advanced optical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Plasmonic metasurfaces offer tunable optical properties.
- Titanium dioxide (TiO2) is a versatile material for nanophotonics.
- Fano resonances provide sharp spectral features for sensing and color generation.
Purpose of the Study:
- To design and fabricate a TiO2 nanowire array metasurface.
- To engineer Fano resonances for vivid structural colors and biochemical sensing.
- To investigate the influence of geometrical parameters on optical properties.
Main Methods:
- Fabrication of TiO2 nanowire arrays integrated with plasmonic layers.
- Characterization of reflection spectra by tuning nanowire dimensions (length, diameter, period).
- Testing with refractive index fluids for sensing capabilities.
Main Results:
- Achieved high-quality factor single peaks in reflection spectra, producing vivid structural colors.
- Demonstrated vivid colors in bright field reflection from nanowire arrays.
- Exhibited potential for biochemical colorimetric sensing with a bulk sensitivity of 183 nm/RIU.
Conclusions:
- The developed TiO2 metasurface enables vivid structural colors and sensitive refractive index sensing.
- This work presents a novel approach for creating colorful nanostructures.
- The metasurface shows promise for applications in optical sensing and color generation.
